Coating shoe



Feb. 23, 1954 J. A. CUNNINGHAM 2,670,240

COATING SHOE Filed Nov. 16, 1951 W INVENTOR. J .A. CUNNINGHAM BY ATTORNEY Patented Feb. 23, 1954 2,670,240

"UNI TED PATEN T OF Fl CFE 2,670,240 G'OATING SHOE Joseph Cunningham, Tulsa, Okla., assignor to Perra,ult :Bros., Tulsa, Okla, a corporation of Delaware Application November 16, 1951, Serial N 0. 256,795-

23 Claims. (01.299-428) This invention relates to improvements in Another object of this invention is to provide coating shoes of the type used on pipefline coatan improved coating shoe capable of being used ing machines. on Various sizes of pipes.

One of the mostpopular types ofcoating shoes Another object of this invention is to =reduce used in the industry is an annular shaped the loss of coating material whenusing a spray shoe adapted to looselysurround the pipe being type coating shoe.

coated. A plurality of circumferentially spaced A further object of this invention is to improvea-pei'tures are provided in the inner periphery of the efiiciency of spray type coating hoes. the shoe to spray the coating materialonto the A still further object of this invention is to pipein a series of relatively closely spaced streams s provide an improved spray type coating shoe around the entire circumference of the pipe. Each which may be economically manufactured.

stream of-the coatingmaterial isdi'rected toward Other objects and advantages of the inven- =the pipe in-substaiitially aradial direction. The tion will be evident from the following detailed tendency-of the coatingmateriai to spread upon description, read in conjunction with :theacccmcontact with the pipe is relied upon' to provide a 1 panying drawings, which illustrate my invention.

layer of the coating material on the pipeibetween In the drawings:

the adjacent streams. Figure 1 is anend -elevat onal view of 'a-coating It will be apparentthat when a particular coatshoe shown disposed around a pipe. T

mg shoe is used one. pipe sliglitly larger than con- Figure 2 is a cross sectional viewtake a b templated, the streams of coating material will 2 lines 2-2 of Fig. :1.

be spaced further part :upon contact with the Figure 3 is a cross sectional view.=similar to pipethan contemplated. In sucha situation the Fig. 2, of a modified coating shoe.

coating material will not spread sumciently be- Referring to the drawings in detail, and partween the adjacent streams to completely coat 'ticularly'to Fig. 1, reference character tgenerally the pipe. The resulting voids provide vulnerable designates an annular shaped coating shoe {surpoints for corrosion of the pipe. In addition, a rounding a pipe 6. 'It willbeunderstood that 'the change in the temperature or consistency of :the coating shoe 4 is supported (not shown) "by a coating material will affect the spreading qualisuitable pipelin coat ng-m hin t ghoami ties of the material and hence theefficiency of The coating shoe 4 comprises alrallnlllar houging the coating shoe. Furthermore, pits or recesses tlsubstantiallysquare shaped in cross section as is in the outer surface of a pipe are frequently not more clearly shown in Fig. 2. One side 110 of completely covered by such-anintermittent applithe housing 8 may be cut away EHdprpVidedith cation of the coating material. The ineflic iency asuitableinspectionplatelZ to facilitate cleaning of this type of shoe is partially overcome by apof the shoe 4 if desired. The housing 8 maybe a plying an excessive amount of coating material unitary structure as shown or may be divided onto the pipe. However, this results in-asubstaninto segments (not-shown) to-facilitateithe positial amount of waste-since the'excessive coating tioning thereof around the pipe 6 in amanner material usually runsoiT-the pipe and .is lost. well known in the art. A-pairof couplings M are The present invention contemplates an imsecured at diametrically opposite points on' the provement of spraytypecoatingshoes by providhousing 8 to provideinlets for coatingmaterialjpr ing an annular-splash .ring aroundthe inner pe- 40 dope to the shoe 4. Usually, a single row' of aperriphery of such a shoe. The splash ring is so tures l6 are provided inthe inner --periphery,-or

constructed and arranged to vjoin the various plate 18, 0f the housing '8 in 'oircumferentially streams of coating material emittingfrom the spaced relationship. The apertures l6 are prefershoeinto asinglestream and provide a. continuous ably radially disposed with respect to the pipe 6 ,curtain of coating material for application on and provide outlets for the-coatingmaterial or the pipe. 'Acontinuous coator layer ofcoating dope from the shoe 4.

material isthereby assuredly applied on the pipe, A novel ring 20, sometimes hereinafter called and a coating shoe of a given diameter may be a splash ring, is disposed on the inner periphutilized on various sizes vof pipes. Furthermore, cry of the housing-8. The outer diameter ofthe the quantity of the coating materialused may be splash ring at is preferably of a sizetoprovide a more closely controlled. tight frictional fit of'the ring 20 in the-platen ;to

important object of this invention is to permit adjustment of the ring-2t. However,'-;the

Diovijdeimprove d spray 'typegcoating shoe so splash ring Zomay'be secured to the housing 8 constructedjandalj ien ed'to emit a continuous in any suitable manner such as ;by:weld ing 'tnot annular'curtain or'coating material. shown) desired. One side face 2-2 of the splash ring 2!! is beveled outwardly from the outer diameter of the ring toward the inner diameter thereof for purposes as will be hereinafter set forth. The splash ring is positioned within the inner plate [8 of the housing 8 in such a manner that the beveled face 22 overlies the apertures It.

A plurality of studs 24 are provided in circumferentially spaced relationship on the inner periphery of the splash ring 20 to receive adjusting eye bolts 26. The eye bolts 26 extend through complementary apertured brackets 28 secured on the inner plate l8 of the housing 8 and are se cured thereto by nuts 30 to provide for longitudinal adjustment of the splash ring 20 in the housing 8 in an obvious manner.

OPERATION In operation of the coating shoe 4, hot coating material is supplied to the housing 8 through the couplings l4 in a manner well known in the art. From the housing 8, the coating material is sprayed through the apertures it onto the beveled face 22 of the splash ring 20. It will be apparent that the splash ring 20 will cause the adjacent streams of coating material being emitted through the apertures 16 to spread and join upon contact with the face 22. In this manner the coating material takes the form of a single stream continuous around the entire circumference of the splash ring 20 when flowing from the splash ring 20 inwardly toward the pipe 6. The form of the flowing coating material between the splash ring 20 and the pipe 6 may be described as a continuous curtain or sheet to contrast the type of 9 flow with a plurality of individual streams such as would occur in the absence of the splash ring 20.

The position of the splash ring 20 with respect to the apertures l6 may be readily adjusted through the medium of the bolts 26, nuts 3%? and brackets 28 in an easy and convenient manner. It will be apparent that when the coating shoe 4 is moved axially over the pipe 6, in either direction, a continuous coat or layer of the coating material will be applied on the outer surface of the pipe 6.

A modified coating shoe generally indicated at 32 is illustrated in Fig. 3, and comprises an annular housing 34 having an inspection plate 36 secured to one side thereof. Couplings 38 are provided at diametrically opposite points on the housing 34 and provide inlets for coating material to the housing 34 in the usual manner.

Two rows of circumferentially spaced apertures 40 are provided in the inner plate 42 of the housing 34 to provide discharge ports for coating material in the housing 34. The apertures 40 are preferably drilled or formed to extend radially in the same manner as the apertures I6 in the shoe 4.

Asplash ring 44 is disposed on the inner periphery of the housing 34 adjacent each row of apertures 40. The outer diameter of each splash ring 44 is preferably of a size to provide a tight frictional fit of each ring 44 with the inner plate 42 of the housing 34 to permit adjustment of the rings 44. However, the rings 44 may be welded (not shown) or otherwise suitably secured to the plate 42 if desired. One side face 455 of each ring 44 is beveled outwardly from the outer diameter of the ring toward the inner diameter thereof. The rings 44 are arranged in the shoe 2 in such a manner that the beveled side face 46 of each ring 44 is adjacent to and overlies one row of the apertures 40. In this manner, the streams of coating material discharging from the apertures 40 will contact the respective beveled face 46 and spread in the same manner as previously described.

The purpose of two rows of apertures 40 is, of course, to increase the rate of discharge of coating material from the shoe 32 without the loss of the advantages of a spray type coating shoe. One of the rings 44 may be dispensed with entirely, or shortened to extend only partially around the inner circumference of the shoe 32, if the particular coating material being utilized will spread on a pipe sufficiently without the use of both of the splash rings 44.

From the foregoing it is apparent that the present invention provides an improved spray type coating shoe adapted to discharge a single stream, or continuous curtain, of coating material inwardly toward a pipe. By combining the various streams of coating material as the coating material discharges from the shoe, a coating shoe of a given size may be used on various sizes of pipes with equal eificiency. Furthermore, the amount of coating material may be more closely controlled due to the fact that an excessive amount of coating material need not be applied on the pipe to obtain an uninterrupted coat. It will also be apparent that the present coating shoe may be economically manufactured.

Changes may be made in the combination and arrangement of parts as heretofore set forth in the specification and shown in the drawings, it being understood that any modification in the precise embodiment of the invention may be made within the scope of the following claims without departing from the spirit of the invention.

I claim:

1. A coating shoe for applying coating material on a pipe, comprising an annular housing of a size to loosely surround the pipe and having inlets for coating material, a plurality of circumferentially spaced discharge apertures in the inner periphery of the housing, said discharge apertures being radially disposed to direct coating material discharging therethrough in a radial direction toward the pipe, and an annular splash ring contacting the inner periphery of the housing adjacent the discharge apertures, the side face of said ring adjacent the discharge apertures being beveled outwardly from the outer diameter of the ring toward the inner diameter thereof and arranged to overlie the di charge apertures, whereby the coating material diucharging through said apertures will contact said beveled face and spread for flow in a continuous curtain toward the pipe.

2. A coating shoe for applying coating material on a pipe, comprising an annular housing of a size to loosely surround the pipe and having inlets for coating material, two rows of radially disposed circumferentially spaced discharge apertures in the inner periphery of the housing, and an annular splash ring secured on the inner periphery of the housing adjacent each row of discharge apertures, the side face of each splash ring adjacent the respective row of discharge apertures being beveled and arranged to receive coating material discharging through said apertures, whereby the coating material will be spread during discharge thereof from the shoe.

3. A pipe line coating shoe for a traveling pipe line coating machine, comprising an annular housing of a size to loosely surround the pipe and having inlets for coating material, a plurality of circumferentially spaced discharge aper- 5 tures in the inner periphery of the housing, said discharge apertures being radially disposed to direct coating material discharging therethrough in a radial direction toward the pipe, and a splash ring contacting the complete inner periphery of the housing adjacent the discharge apertures, the side face of said ring adjacent the discharge apertures being beveled outwardly from the outer diameter of the ring toward the inner diameter thereof and arranged to overlie the discharge apertures, whereby the coating material discharging through said apertures will contact UNITED STATES PATENTS Number Name Date Re. 13,366 Bowers Feb. 6, 1912 963,354 Braemer July 5, 1910 2,288,316 Focha June 30, 1942 2,340,325 Horrigan Feb. 1, 1944 2,478,357 Bagley et al Aug. 9, 1949 2,509,238 Martin May 30, 1950 

